int a[] = {5, [2] = 2, 3};

int main() {
    if (sizeof(a) != 4 * sizeof(int))
        return 1;

    if (a[0] != 5)
        return 2;
    if (a[1] != 0)
        return 3;
    if (a[2] != 2)
        return 4;
    if (a[3] != 3)
        return 5;

    return 0;
}
